No, they stay red, no matter whether I switch to console with gimp
running or starting it again after switching or logging out and in
again.

I also did a zypper refresh/zypper up cycle. There are no updates in
the
pipeline.

What does zypper dup say?

Note that the xorg-x11-server package gets a 'downgrade' from RPM's PoV
(version was normalized to actually represent what it really is); so
you might have a mix-and-match of incompatible X-support infra.